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I G. A. SMITH.

FEEDING MECHANISM FOR SEWING MACHINES.

No. 99,962. Patented Feb, 15, 1870.

- ing is a full, clear, and exact description of thesan'ie,

than Gtjijiitt.

GEORGE Ajsnrraor PHILADELPHIA, PENNSYLVANIA.

Lam Patent No. 99,902, dated February '15, 1870.

impaovimvrnu'r m FEEDING MECHANISM FOR snwrrramaer-rme.

The Schedule referred to in these Letters Patent and'making part of the same.

To all whom it may concern:

Be it known that I, GEORGE A...SMITH, 'of the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Sewing-Machines; and I do hereby declare that the followwhich will enable others skilled in the art to which my invent-ion appertains to make and use the same, ref-- erence being bad to the annexed drawings which. forms a partof this specification, and in which- Figure l is a perspective view of so much of a sew ing-machine as is necessary to the exhibition of my improvement, and

Figure 2 is a perspective view ot' the some detached from the frame;

The same letters of reference designate the same parts in bot-l1 figures. 4 v My invention-relates more particularly to the devices whereby the throw of the feed is adjusted so as to make'a longer or shorter stitch as mav be desired;

and

It consists in mounting the adjusting device on the vibrating feed-bar, so as to move with it, and in combining it with a radius bar and vibrating arm, as hereinafter described.

That others skilled in the art to which my invention appertains may be enabled to make and use the same, I hereby describe its construction and operation.

A A, fig. 1. is a part of the frame of asewing-machine.

B B is the feed-bar, to which are attached the stops 0 D, the eye It, the stud F, and the lug G.

The feed-bar is provided with a groove seen at a, in --hich the feed-dogJzI, whose upper surface is serrated, slides vertically, and may be adjusted at any desired heigr by the set-screw I working in the slot 6:

The feed-bar slides longitudinally in the guides J J, fig. 1, east on the frame A.

A p not shown in the drawing, passes through the slot 0, fig. 2, preventing vertical motion of that end of the feed-bar, win. the other end thereof is free to move ertically in the guides.

K s a pin or stud screwed into the frame, andserving as a pivot for the tubular rock-shaft L of the vibrating arm M, the end of which is grooved, as seen at (I, tor the insertion of rawhide or similarmaterial, to be moisiened with oil.

N is a radius bar, provided with a pin, 0, at its extremity, whieh'bears against the arm M.

The radius bar is pivoted to the stud F, around which'it is formed into a toothed segment, whose teeth gear intothe thread of the adjusting worm P, so that by turning the milled head Q the radius bar is vibrated and its extremity elevated or depressed.

' R is a cam mounted on the driving shaft of the machine, and constructed with two cam faces on one of which the feed-bar B boars, while thelend of .the .vibrating arm is pressed against the other face by the pin O of the radius bar, the latter being pivoted as aforesaid to the stud F on. the feed-bar, and the feedbar being retracted by the spring S, one end of which is hooked to the eye E, and the other to the flame.

The operation is as follows \Vhen the cam is revolved by the revolution of the driving shaft, the feed-bar is raised by the inner face of the cam, and at the same time carried forward by the action of the outer cam face on the vibrating arm, which bearing against the pin 0 draws the radius bar and feed-bar forward, and when the cam ceases to bear against the vibrating arm, the feed-bar is retracted by the spring S, and at the same time descends by its own weight, the inner face of the cam permitting it to fall.

By means of the adjusting worm, the throw of the feed-bar may be varied and the stitch thereby made longer or shorter as described. The throw is lengthened by depressing the extremity 0 of. the radius bar, and shortened by raising it. The adjustment is limited in either direction by the stops 0 l).

Insteadof' a worm gearing into a cogged segment, a screw or other equivalent device may be attached to the feed-bar for. the purpose of elevating or depressing the radius bag,

What I claim as my invention, and desire to secure by Letters Patent of the United States, 'is-.

The adjusting screw or worm attached to and vi-' brating with the feed-bar, in combination with a radius barand vibrating arm.

G. A. SMITH.

, Witnesses:-

,JOHN WHITE,

W. A. A. McKINLEY. 

